WO1999032054A1 - Prothese discale partielle - Google Patents
Prothese discale partielle Download PDFInfo
- Publication number
- WO1999032054A1 WO1999032054A1 PCT/FR1998/002798 FR9802798W WO9932054A1 WO 1999032054 A1 WO1999032054 A1 WO 1999032054A1 FR 9802798 W FR9802798 W FR 9802798W WO 9932054 A1 WO9932054 A1 WO 9932054A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- prosthesis
- core
- prosthesis according
- cap
- caps
- Prior art date
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Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
- A61F2/4603—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof
- A61F2/4611—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof of spinal prostheses
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- A—HUMAN NECESSITIES
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/44—Joints for the spine, e.g. vertebrae, spinal discs
- A61F2/442—Intervertebral or spinal discs, e.g. resilient
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- A—HUMAN NECESSITIES
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
- A61F2/30907—Nets or sleeves applied to surface of prostheses or in cement
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- A—HUMAN NECESSITIES
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/44—Joints for the spine, e.g. vertebrae, spinal discs
- A61F2/4455—Joints for the spine, e.g. vertebrae, spinal discs for the fusion of spinal bodies, e.g. intervertebral fusion of adjacent spinal bodies, e.g. fusion cages
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- A—HUMAN NECESSITIES
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
- A61F2/4603—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30003—Material related properties of the prosthesis or of a coating on the prosthesis
- A61F2002/3006—Properties of materials and coating materials
- A61F2002/30069—Properties of materials and coating materials elastomeric
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
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- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30108—Shapes
- A61F2002/3011—Cross-sections or two-dimensional shapes
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
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- A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
- A61F2002/30383—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by laterally inserting a protrusion, e.g. a rib into a complementarily-shaped groove
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
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- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
- A61F2002/30448—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements using adhesives
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
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- A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
- A61F2002/30518—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements with possibility of relative movement between the prosthetic parts
- A61F2002/30528—Means for limiting said movement
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- A—HUMAN NECESSITIES
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
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- A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30563—Special structural features of bone or joint prostheses not otherwise provided for having elastic means or damping means, different from springs, e.g. including an elastomeric core or shock absorbers
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- A—HUMAN NECESSITIES
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- A61F2002/4627—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof with relative movement between parts of the instrument during use with linear motion along or rotating motion about the instrument axis or the implantation direction, e.g. telescopic, along a guiding rod, screwing inside the instrument
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- A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
- A61F2310/00005—The prosthesis being constructed from a particular material
- A61F2310/00011—Metals or alloys
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- A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
- A61F2310/00005—The prosthesis being constructed from a particular material
- A61F2310/00011—Metals or alloys
- A61F2310/00023—Titanium or titanium-based alloys, e.g. Ti-Ni alloys
Definitions
- the present invention relates to a partial disc prosthesis.
- disc prostheses which can be partial or total, are intended to replace all or part of an intervertebral disc when the latter has been destroyed by surgery or by disease.
- a first type of disc prosthesis consists of a rigid cage, which may for example be of rectangular cross section, in which are provided perforations suitable for receiving grafts intended to ensure satisfactory solidification of this cage with the two vertebrae between which it must be inserted.
- This type of rigid cage which is implanted in particular by impacting or by screwing, has a drawback in that it leads to complete blocking of the two vertebrae between which the cage is disposed, which limits the patient's freedom of movement.
- EP-A-0 346 269 also discloses an intervertebral disc prosthesis formed by a core of viscoelastic material interposed between two metal covering plates, which are intended to be in contact, once implanted, with the surface vertebrae.
- an intervertebral disc prosthesis formed by a core of viscoelastic material interposed between two metal covering plates, which are intended to be in contact, once implanted, with the surface vertebrae.
- the invention proposes to produce a partial disc prosthesis, which can be anterior or posterior, the placement of which in the intervertebral space is easy, which has a satisfactory stability within this intervertebral space and which allows sufficient freedom of movement while guaranteeing the maintenance of a physiologically advantageous posture.
- the subject of the invention is a partial disc prosthesis intended to be inserted between two neighboring vertebrae, of the type comprising a core made of an elastic material such as a silicone polymer or an elastomer, covered with te, on a part of its periphery, by a coating made of a rigid material and intended to be in contact with said two neighboring vertebrae, characterized in that said core comprises, in transverse section, two end portions connected by a portion median, said coating comprises two caps provided with a thread and at least partially covering the external periphery of said end portions, and the distance separating said caps increases towards the front part of the prosthesis.
- a core made of an elastic material such as a silicone polymer or an elastomer
- the invention also proposes to produce a fitting tool for the prosthesis as described above, which ensures easy implantation of the latter, which can be easily removed once the prosthesis is implanted and which makes it possible to preserve the integrity of the different bodies in the vicinity of which this tool is moved during all of these operations.
- the invention also relates to a fitting tool for the prosthesis as described above, characterized in that it comprises a gripping handle extended by means suitable for securing said prosthesis relative to said tool in a transversely compressed state of said prosthesis.
- FIG. 1 is a partially cutaway perspective view of a first embodiment of a disc prosthesis according to one invention
- FIGS. 2 and 3 are exploded end views respectively representing the front and rear parts of the prosthesis shown in Figure 1;
- FIG. 4 is a schematic perspective view, broken away, of a setting tool for the prosthesis shown in Figures 1 to 3;
- FIG. 5 is a perspective view showing the prosthesis of Figures 1 to 3 engaged in the delivery tool of Figure 4;
- FIG. 6 is a sectional view along the line I -VI in Figure 5;
- FIG. 7 is a schematic view illustrating the implantation of the prosthesis of Figures 1 to 3;
- FIG. 8 is a schematic view illustrating the separation of the delivery tool of Figure 4, relative to the prosthesis of Figures 1 to 3, after implantation of the latter;
- FIG. 9 is a schematic perspective view of a prosthesis according to a second embodiment of the invention.
- FIG. 10 is an axial sectional view of a prosthesis according to a third embodiment of one invention.
- FIG. 11 is an axial sectional view of a fourth embodiment of a disc prosthesis according to one invention.
- FIGS. 12 and 13 are end views respectively representing the front and rear parts of the prosthesis of Figure 1;
- FIG. 14 is a schematic perspective view, with cutaway, of the various components of a setting tool for the prosthesis shown in Figures 11 to 13;
- FIG. 15 is a longitudinal sectional view illustrating the attachment of the setting tool of Figure 4 and the prosthesis of Figures 11 to 13;
- FIG. 16 is a partial end view, illustrating the tongues with which the prosthesis shown in Figures 11 to 13 is provided, when the latter is implanted;
- Figure 17 is a view similar to Figure 16, illustrating the respective position of the tongues of the prosthesis for the removal of the latter;
- FIG. 18 is a perspective view of a fifth embodiment of a disc prosthesis according to one invention.
- FIGS. 19 and 20 are longitudinal sections along the line XIX-XIX in Figure 18, in positions respectively of rest and compression of the prosthesis of this figure 18;
- FIGS. 21 and 22 are cross sections along the line XXI-XXI in Figure 18, in positions of rest and compression of the prosthesis of this figure 18 respectively;
- - Figure 23 is a perspective view with cutaway of a composite core of a prosthesis according to one invention and - Figure 24 is a longitudinal sectional view of a core formed of several elements belonging to a prosthesis according to the invention.
- the disc prosthesis according to one invention comprises a core 4 whose outer surface is partially covered by means of two coatings formed by caps 6.
- L 'core 4 is made of a biocompatible elastic material, such as for example a silicone polymer or a prestressed rubber.
- the caps 6 are made of a rigid biocompatible material such as for example special steel, in particular titanium, and are secured to the core for example by a silicone glue or the like.
- the cross section of the core 4 is made up of two end portions 8, the outer periphery of which describes an arc of a circle, which are connected by two flats 10 forming a middle part 12.
- a recess 20 in the form of a cup is formed in the front end of the core 4, and constitutes a bending initiation, as will be visible in the following description.
- Each cap 6 is produced in the form of a profile having, in cross section, the shape of an arc of a circle. These caps cover the entire outer periphery of the end portions 8 of the core 4, while the flats 10 are not covered. The outer surface of these caps is provided with a thread 14 intended to facilitate the implantation of the prosthesis, as will be explained in the following.
- the outer surface of the caps 6 also has irregularities formed for example by embossing or sintering, which are intended to guarantee good stability of the prosthesis once fitted.
- Axial grooves 16 are further provided over the entire length of each cap, in the vicinity of each edge 18 of the latter.
- transverse dimension or width D of the end portions 8 is substantially constant throughout the prosthesis, while the dimension or height H of the flats 10 connecting these end portions, increases towards the front by the prosthesis, referring to the prosthesis once mounted on a patient.
- the distance between the caps increases towards the front of the prosthesis.
- the distance separating the caps is understood to mean the maximum distance, in cross section, separating, in the compressed position of the prosthesis, the respective zones of contact of the caps with the vertebrae.
- the length of the prosthesis namely the distance separating its front and rear ends, is for example of the order of 16 to 20 mm
- its minimum height H at the rear part of the prosthesis is of the order of 12 mm
- its maximum height H is of the order of 16 mm.
- the radius of curvature of the inner part of each cap is for example close to 12 mm, and these caps extend over an angular sector of the order of 120 ° each.
- the thickness of the caps is for example about 2 mm.
- FIG. 4 represents a tool designated as a whole by the reference 22, intended for placing the prosthesis 2 within the intervertebral space of a patient.
- This tool 22 comprises an elongated cylindrical handle 24, the dimensions of which are suitable for providing easy grip by a surgeon.
- This handle 24 is pierced with a central co-axial orifice 26, the transverse dimensions of which are smaller than those of the rear part of the prosthesis 2.
- This orifice 26 is suitable for the passage of a rod 27, as will be explained in what follows.
- the handle 24 is terminated by two tongues 28 symmetrical to each other produced in the form of a thin section in the shape of an arc of a circle.
- These tabs have a radius of curvature close to that of the caps 6 of the prosthesis and extend over angular sectors whose value, added to that of the angular sectors of the caps 6, is slightly greater than 360 °.
- Axial ribs 30 project inwardly over the entire length of each tongue, at each of the edges 32 thereof, as shown in particular in Figure 6. The transverse dimensions of these ribs are such that they are suitable for being housed in the grooves 16 formed in the caps 6.
- the longitudinal dimension of the tongues 28 is similar, or even very slightly greater, than that of the entire prosthesis 2.
- FIGS 5 and 6 show the prosthesis 2 engaged in the cylindrical volume defined by the tongues 28 of the setting tool 22.
- the prosthesis For the mounting of the prosthesis, it is first of all necessary to engage the end of the ribs 30 , opposite the handle 24, in the rear end of the grooves 16. Then, it is a question of compressing, for example manually, the front of the prosthesis, which is possible both due to the elastic nature of the 'soul 4 and the presence of the recess 20. Then, each rib 30 is slid within a corresponding groove 16, until the rear end of the prosthesis 2 abuts against the end of the handle 24 adjacent to the tongues 28.
- the prosthesis maintained in cylindrical form has undergone an overall reduction in its transverse dimensions due to compression, becoming more and more noticeable as it goes towards the front of the prosthesis.
- the middle part 12 of the prosthesis is in particular subjected to forces tending to direct its outer periphery towards the tongues 28 of the fitting tool.
- the assembly consisting of the compressed prosthesis and the tongues 28 of the fitting tool has a generally cylindrical shape.
- the prosthesis 2 is assembled by screwing by means of the handle 4 of the setting tool 22.
- the thread 14 which is provided with the outer surface of the caps 6 is advantageous with regard to this surgery .
- FIG. 8 illustrates the operation consisting in removing the fitting tool 22 from the prosthesis 2.
- the latter is held axially by means of the rod 27 penetrating into the the orifice 26 formed in the handle 24.
- the ribs 30 of the tongues 28 are slid backwards along the grooves 16 of the caps 6.
- the prosthesis then recovers its original shape, as shown in FIGS. 1 to 3, due to the nature of its prestressed constituent material.
- FIGs 5 to 8 illustrate the implantation of a prosthesis 2 intended to be placed at the rear of the intervertebral space and therefore to constitute a posterior partial prosthesis. It can also be provided that this prosthesis 2 is positioned at the front of this intervertebral space. To this end, this prosthesis should be secured to the fitting tool 22 by placing its flared front part adjacent to the handle 24. The fitting of this prosthesis is then carried out by screwing, as in the example described with reference to FIG. 7. This implantation is carried out from the anterior part of the patient, for example by laparoscopy.
- FIG. 9 represents a prosthesis 102 according to a second embodiment of the invention.
- the core 104 of the latter comprises, analogously to that 4 described with reference to the preceding figures, two end portions
- FIG. 10 shows a prosthesis 202 according to a third embodiment of the invention.
- This prosthesis 202 comprises two coatings formed by caps 206A and 206B respectively upper and lower of equivalent axial dimensions.
- the upper cap 206A protrudes beyond the front end of the core 204, in a manner similar to the prosthesis 102.
- a stop 240 protrudes from the lower cap 206B in the direction of the upper cap 206A.
- the dimensions of this stop are such that it limits the inclination movement of the upper cover 206A to a value determined with respect to an axis (A ') parallel to the axis (A) of the lower cover.
- the maximum inclination of the upper cover 206A can be limited to approximately 5 ° (angle ⁇ ) downward, relative to the axis (A ').
- the stop 240 is made of a material similar to that constituting the core 204, and can be made integrally with the latter.
- the undescribed elements of this prosthesis are similar to those of prosthesis 102.
- FIGS. 11 to 13 represent a fourth embodiment of a partial disc prosthesis according to the invention, designated as a whole by the reference 302.
- This prosthesis comprises a core 304 made of a biocompatible elastic material, such as for example a silicone polymer or a pre-stressed rubber, core 304 whose outer surface is partially covered by means of two caps 306A, 306B forming a coating. These are carried out in a biocompatible rigid material such as by example a special steel, in particular titanium, and are subject to the core 304 for example by a silicone adhesive.
- a biocompatible elastic material such as for example a silicone polymer or a pre-stressed rubber
- the section of the core 304 consists of two end portions 308 whose outer periphery describes an arc of a circle, which are connected by two flats 310 forming a middle part
- the transverse dimension or width D of the end portions 308 is substantially constant along the prosthesis 302 while the dimension or height H of the flats 310 connecting the end portions increases towards the front of the prosthesis with reference to once implanted in the body of a patient.
- the core 304 is provided with a first and a second recess 314, 316, also called anterior and posterior recesses. It should be noted that the anterior recess 314 has greater axial dimensions and a smaller radius of curvature than those of the posterior recess 316.
- cup-shaped recesses 314, 316 constitute bending caps, their respective dimensions giving a privileged aspect to forward bending.
- the anterior recess 314 is extended, at one of its ends, by an extension 318 of the core 304, so that one of the end portions 308 has longitudinal dimensions greater than those facing it.
- the prosthesis 302 is pierced longitudinally with a through hole 318, intended for the passage of a rod of a setting tool as will be explained in the following.
- Each cap 306 is produced in the form of a profile having, in cross section, the shape of an arc of a circle. These caps cover the entire outer periphery of the end portions 308 of the core 304, while the flats 310 are not covered. The outer surface of these caps is provided with a thread 321 intended to facilitate the implantation of the prosthesis, as will be explained in the following.
- the outer surface of the caps 306 has irregularities formed for example by embossing or sintering, which are intended to guarantee good stability of the prosthesis once implanted.
- the caps 306 are provided, at their anterior end, with respective flaps 322 projecting towards one another, so as to partially overlap in the free state of the prosthesis. Due to the extension 318, one 322A of these flaps is further from the rear end of the prosthesis than the other flap 322B. For the sake of clarity, these flaps 322A, 322B will therefore be called distal and proximal respectively.
- Each of these flaps is provided with a respective opening 324A, 324B of substantially circular section.
- the location of these openings is such that the latter are mutually aligned in the longitudinal direction of the prosthesis and are co-axial with the orifice 320, when the prosthesis is in a transversely compressed state, as will be described in particular in the reference to FIG. 15.
- the cap provided with the distal flap 322B is terminated by a projection 326 extending beyond this flap, opposite the core 304. This projection 326 constitutes a stop for the distal flap 322A, so as to limit the overall bending movement of the anterior part of the prosthesis.
- FIG. 14 represents a tool, designated as a whole by the reference 328, intended for the fitting of the prosthesis represented in FIGS. 11 to 14.
- This tool 328 comprises first and second removable elements 330, 332.
- the first element 330 consists of a cylindrical barrel 334 assuming a gripping handle function, terminated by two tongues 336 with a cross section in the shape of an arc of a circle, intended to bear against the edges of the caps of the prosthesis as will be described in the following .
- the barrel 334 is hollow and annular and comprises a cylindrical axial housing 338.
- the second element 332 is constituted by a cylindrical rod 340 terminated by a thinned end 342 intended to form a key, the function of which will be explained in particular with reference to FIGS. 16 and 17.
- the main transverse dimension, or width 1., of this end 342 decreases opposite the rod 340.
- the rod 340 is extended, at opposite its end 342, by an enlarged cylindrical portion 344, for adaptation in the housing 338 of the barrel 334.
- the adaptation portion 344 is itself terminated by a handle 346.
- the rod 340 and the portion of adaptation 344 are free to slide relative to the barrel 334 and to pivot around the main axis of the latter.
- FIG. 15 illustrates the mutual securing of the fitting tool 328 and of the prosthesis 302.
- the rod 340 it is first of all necessary to insert the rod 340 then the adaptation portion 344 in the annular housing 338. Then, it is to compress the prosthesis 302, so that the latter has a generally cylindrical cross section. Such compression can be ensured for example manually or by means of an appropriate clamp.
- the rod 340 is then introduced, through its thinned end 342, through the orifice 320 and then into the two openings 324A, 324B arranged in the extension of one another. The insertion of this rod 340 then secures the prosthesis 302 and the setting tool 328 in the transversely compressed state of the prosthesis.
- the barrel 334 was moved longitudinally, so that the tongues 336 bear against the edges of each cap 306A, 306B, so as to form, with the external surface of the prosthesis, a generally cylindrical surface.
- the implantation of the prosthesis in the patient's body is carried out by screwing by means of an action exerted on the barrel 334 forming a handle.
- the threads 321 with which the outer periphery of the caps 306 is provided are advantageous with regard to this operation.
- FIG. 16 shows the mutual positioning of the flaps 322A, 322B, once the prosthesis 302 has been implanted in the patient's body.
- the prosthesis is then in a state of intermediate compression between its free state shown with reference to FIGS. 11 to 13 and its compressed state for installation, shown in FIG. 15.
- the prosthesis 302 illustrated in FIGS. 15 to 17 is a posterior prosthesis, since its implantation is carried out from the patient's back and that it must replace the posterior part of the disc.
- Such a prosthesis 302 can also be implanted from the anterior face of the patient in order to be arranged in the anterior, even antero-median part of the intervertebral space. This implantation differs from that described above only in the sense that, to secure the rod 340 relative to the prosthesis 302, it is necessary to introduce this rod firstly through the openings 324A, 324B of the prosthesis, then at within orifice 320 of the latter.
- the prosthesis 302 has been shown with end portions 308 whose transverse dimension is substantially constant all along this prosthesis. It is also possible to provide that these ends, while having a substantially constant radius of curvature all along this prosthesis, extend along an angular sector which increases continuously towards the anterior part of the prosthesis.
- FIGS 18 to 22 show a fifth embodiment of a partial disc prosthesis according to the invention, designated as a whole by the reference 402.
- This prosthesis comprises a core 404 made of an elastic bio-compatible material and whose surface exterior is partially covered by means of a coating formed by two elements 406A and 406B.
- the latter executed in a rigid bio-compatible material, are subject to the core 404 for example by means of a silicone adhesive.
- the cross section of the core 404 is composed of two end portions 408 whose outer periphery describes an arc of a circle and which are connected by two flats 410 forming a middle part 412.
- the transverse dimension or width of the end portions 408 is substantially constant all along the prosthesis 402, while the height of the flats 410 increases towards the front of the prosthesis, with reference to the latter once implanted.
- Each coating 406 comprises a central cap 414 intended to come into contact with the core 404.
- This cap 414 is connected to a peripheral cap 416 produced in the form of a profile having, in cross section, the shape of an arc of a circle.
- the outer surface of these caps is provided with a thread 418 intended to facilitate the implantation of the prosthesis.
- the connection zone between the cap 414 and the cap 416 comprises a peripheral border 420 extending around the cap and extended by two longitudinal tabs 422. These define, in the vicinity of the border 420, two longitudinal slides or grooves 424. These tabs 422 also delimit, with end flaps 426, a through notch 428 in the shape of an arc of a circle.
- Each flap 426, 427 extends from one of the coatings 406 towards that which is opposite to it, in a manner substantially perpendicular to the main axis of the prosthesis. These flaps are arranged asymmetrically.
- the front flap 426A of the first coating 406A and the opposite flap, namely the rear flap 427B of the other coating 406B extend, according to their main dimensions, so as to form an overlap zone ZR.
- the latter is particularly visible in Figure 21.
- the projections, on the same plane, along the main axis A of the prosthesis, flaps 426A and 427B have a common region, which forms the overlap zone ZR. The presence of the latter is likely to reduce the anteroposterior shear to which the prosthesis 402 is subjected once implanted.
- each flap 426, 427 extends, in the uncompressed rest position of the prosthesis, at a distance from the wall facing the core 404. This contributes to forming longitudinal differential volumes, respectively front 430 and rear 432, which limit the expansion of the prosthesis during its compression.
- Figure 20 which illustrates the maximum compression position of the prosthesis. In this position, the walls of the core 404, which were distant from the flaps 426 in the rest position, bear against the inner face of these flaps. In this compressed position, the facing flaps, namely on the one hand 426A, 427A, and on the other hand 426B, 427B are spaced from one another.
- Each coating 406 is also provided with side skirts. the 434 extending from the peripheral edge 420, between each slide 424 and the cap 414. As shown in particular in FIG. 19, each skirt 434 has, seen from the side, a variable height, namely that it s 'extends in a generally sinusoidal wavy profile. However, each skirt can also include at least one recess. The adjacent skirts, which are provided with two different coatings, have substantially conjugate profiles. Thus, the skirts 434A and 434C on the one hand, as well as the skirts 434B and 434D on the other hand are suitable for coming into mutual nesting.
- two facing skirts that is to say either 434A and 434B, or 434C and 434D, are arranged asymmetrically.
- the projections on the same plane, along an axis perpendicular to the main axis of the prosthesis, of each pair of opposite skirts, have common regions which form these overlapping zones.
- each skirt 434 extends at a distance from the flats 410 of the core 404. This contributes to creating, on either side of the core 404, two differential volumes lateral 436. During the maximum compression of the prosthesis, shown in FIG. 22, the core 404 occupies all of these differential volumes 436, so as to come into contact with the inner face of the skirts 434. In this compressed position , it should be noted that the ends of the adjacent skirts, on the one hand 434A and 434C, on the other hand 434B and 434D, extend at a distance from one another.
- the prosthesis illustrated in FIGS. 18 to 23 is placed using a tool substantially similar to that 22 described in FIGS. 4 to 8.
- the adjacent slides namely on the one hand 424A and 424C, on the other hand 424B, 424D, allow the engagement of tongues similar to those 28 of FIGS. 4 to 8.
- the tool is also provided with additional tongues, not shown in these FIGS. 4 to 8, penetrating into the two notches 428 with which the coatings 406 are provided.
- the mounting of the prosthesis 402 is generally similar to that of the prosthesis 2, illustrated with reference to FIGS. 1 to 8.
- FIG. 23 illustrates a core, designated as a whole by the reference 504, capable of replacing the core of a prosthesis described previously.
- This core 504 is composite, that is to say that it comprises a core 504 'surrounded by an envelope 504' ', the material constituting the core 504' being more compressible than that constituting the envelope 504 ''.
- the core is made of a silicone polymer while the envelope 504 '' is made of polyethylene or polyurethane.
- This core 504 ′ occupies a substantial part of the volume of the core 504, and is surrounded by the envelope over the entire periphery. Provision may be made for the core made of a compressible material to be separated from the external envelope by a succession of intermediate covers, the constituent materials of which have alternating compressibility characteristics. It is also possible to provide for the core in the form of a core of a more compressible material, surrounded by an envelope of a less compressible material. This core will then extend only to the rear part of the prosthesis, the transverse dimensions of which are reduced. The use of a composite core is advantageous in that it limits the expansion of this core and avoids the phenomenon of hernias.
- FIG. 24 illustrates an additional embodiment, in which the core 604 comprises several distinct elements, namely a front element 604 'of larger transverse dimensions, and a rear element 604''of restricted transverse dimensions.
- the terms “front” and “rear” relate to the prosthesis once implanted.
- the front element 604 ' is made of a more compressible material than the rear element 604''.
- Each element respectively front 604 'and rear 604'' comprises two transverse end portions 608', 608 '' connected by respective median portions 612 ', 612''.
- the two end portions of the same element are disposed generally symmetrically with respect to a median plane of the prosthesis, which corresponds substantially to the plane of the intervertebral disc.
- Each end portion 608 ', 608'' is covered by a coating forming a threaded cap 606, the inner wall of which is shaped so as to hold the front and rear elements in place.
- This prosthesis can be provided with a coating similar to that covering the prosthesis of FIGS. 18 to 22.
- the prosthesis according to the invention makes it possible to achieve the objectives mentioned above. Indeed, the conformation in a circular arc of its end portions, as well as the presence of rigid caps provided with an external thread, ensures easy installation by screwing.
- the fact that the prosthesis has larger transverse dimensions at its front part than at its rear part, gives it a lordosis aspect which proves to be advantageous from a physiological point of view.
- the presence of a recess at the front part, or even the rear part of the prosthesis allows it to see its transverse dimensions modified according to the forces it undergoes, which allows great freedom of movement to the patient receiving it.
- the irregularities of the outer surface of the caps guarantee good stability of the prosthesis, both by friction on the vertebrae and due to the bone regrowth which is likely to occur there.
- the fitting of the prostheses shown in all the figures is particularly easy. Indeed, since the prosthesis is able to undergo a significant reduction in its transverse dimensions, it is suitable for being easily installed, without damaging the organs in the vicinity of which it is moved. In addition, the mutual joining and detachment of the prosthesis and the setting tool, which are ensured by longitudinal sliding, allow easy engagement of the prosthesis relative to the setting tool. This method of securing also guarantees the ability to easily remove the fitting tool from the prosthesis, once the latter is implanted. Since the tool is removed longitudinally, there is therefore only a small risk of damaging the members in the vicinity of which this tool is moved.
- flaps in which are formed openings having, once the prosthesis implanted, a covering zone is particularly advantageous. Indeed, this overlap zone allows, thanks to the insertion of the key-forming end of the rod (FIG. 17), to compress the prosthesis even though direct access to the latter is impossible for the surgeon. This measure therefore ensures the possibility of removing the prosthesis without compromising the physical integrity of the patient.
- a differential volume of expansion of the core is also advantageous. This makes it possible to confer three different compression ranges on the prosthesis of the invention. In a first range, called low load, the prosthesis does not deform substantially. In a second range, called medium load, the elastic core is deformed so as to occupy all of these differential volumes. Finally, in a third range, called high load, the prosthesis is substantially rigid, since the core comes into contact, without being able to be substantially deformed, against the walls of the skirts and / or flaps defining these differential volumes.
Abstract
Description
Claims
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU17670/99A AU744241B2 (en) | 1997-12-19 | 1998-12-18 | Partial discal prosthesis |
EP98962522A EP1039855B1 (fr) | 1997-12-19 | 1998-12-18 | Prothese discale partielle |
US09/581,884 US6419706B1 (en) | 1997-12-19 | 1998-12-18 | Partial disc prosthesis |
JP2000525052A JP4046471B2 (ja) | 1997-12-19 | 1998-12-18 | 部分的円板補綴具 |
CA002315803A CA2315803C (fr) | 1997-12-19 | 1998-12-18 | Prothese discale partielle |
AT98962522T ATE269682T1 (de) | 1997-12-19 | 1998-12-18 | Partielle bandscheibenprothese |
DE69824759T DE69824759T2 (de) | 1997-12-19 | 1998-12-18 | Partielle bandscheibenprothese |
AU42382/02A AU775275B2 (en) | 1997-12-19 | 2002-05-20 | Partial disc prosthesis |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9716548A FR2772594B1 (fr) | 1997-12-19 | 1997-12-19 | Prothese discale partielle posterieure |
FR97/16548 | 1997-12-19 | ||
FR98/03268 | 1998-03-12 | ||
FR9803268A FR2775891B1 (fr) | 1997-12-19 | 1998-03-12 | Prothese discale partielle et outil de pose pour une telle prothese |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999032054A1 true WO1999032054A1 (fr) | 1999-07-01 |
Family
ID=26234026
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR1998/002798 WO1999032054A1 (fr) | 1997-12-19 | 1998-12-18 | Prothese discale partielle |
Country Status (10)
Country | Link |
---|---|
US (1) | US6419706B1 (fr) |
EP (1) | EP1039855B1 (fr) |
JP (1) | JP4046471B2 (fr) |
AT (1) | ATE269682T1 (fr) |
AU (1) | AU744241B2 (fr) |
CA (1) | CA2315803C (fr) |
DE (1) | DE69824759T2 (fr) |
ES (1) | ES2222620T3 (fr) |
FR (2) | FR2772594B1 (fr) |
WO (1) | WO1999032054A1 (fr) |
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US7931675B2 (en) | 2004-06-23 | 2011-04-26 | Yale University | Dynamic stabilization device including overhanging stabilizing member |
US8137402B2 (en) | 2002-01-17 | 2012-03-20 | Concept Matrix Llc | Vertebral defect device |
US8172880B2 (en) | 1999-12-01 | 2012-05-08 | Warsaw Orthopedic, Inc. | Intervertebral stabilising device |
US10111755B2 (en) | 2017-02-24 | 2018-10-30 | Warsaw, Orthopedic, Inc. | Expanding interbody implant and articulating inserter and methods of use |
US10470894B2 (en) | 2017-04-06 | 2019-11-12 | Warsaw Orthopedic, Inc. | Expanding interbody implant and articulating inserter and methods of use |
WO2022132533A1 (fr) * | 2020-12-16 | 2022-06-23 | K2M, Inc. | Implant expansible augmentable |
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- 1998-12-18 US US09/581,884 patent/US6419706B1/en not_active Expired - Fee Related
- 1998-12-18 ES ES98962522T patent/ES2222620T3/es not_active Expired - Lifetime
- 1998-12-18 CA CA002315803A patent/CA2315803C/fr not_active Expired - Fee Related
- 1998-12-18 EP EP98962522A patent/EP1039855B1/fr not_active Expired - Lifetime
- 1998-12-18 JP JP2000525052A patent/JP4046471B2/ja not_active Expired - Fee Related
- 1998-12-18 DE DE69824759T patent/DE69824759T2/de not_active Expired - Lifetime
- 1998-12-18 AU AU17670/99A patent/AU744241B2/en not_active Ceased
- 1998-12-18 WO PCT/FR1998/002798 patent/WO1999032054A1/fr active IP Right Grant
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Cited By (35)
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US7655042B2 (en) | 1998-10-29 | 2010-02-02 | Warsaw Orthopedic, Inc. | Expandable intervertebral spacers |
US6833006B2 (en) | 1998-10-29 | 2004-12-21 | Sdgi Holdings, Inc. | Expandable intervertebral spacers |
US6402785B1 (en) | 1999-06-04 | 2002-06-11 | Sdgi Holdings, Inc. | Artificial disc implant |
US6881228B2 (en) | 1999-06-04 | 2005-04-19 | Sdgi Holdings, Inc. | Artificial disc implant |
US8172880B2 (en) | 1999-12-01 | 2012-05-08 | Warsaw Orthopedic, Inc. | Intervertebral stabilising device |
EP1339363A4 (fr) * | 2000-12-04 | 2006-03-15 | Roger P Jackson | Dispositif intervertebral filete |
EP1637096A2 (fr) * | 2000-12-04 | 2006-03-22 | Roger P. Jackson | Dispositif intervertébral fileté |
EP1637096A3 (fr) * | 2000-12-04 | 2006-04-05 | Roger P. Jackson | Dispositif intervertébral fileté |
EP1339363A1 (fr) * | 2000-12-04 | 2003-09-03 | Roger P. Jackson | Dispositif intervertebral filete |
WO2002047586A1 (fr) * | 2000-12-13 | 2002-06-20 | Eska Implants Gmbh & Co. | Implant de remplacement de disque intervertebral partiel |
US8137402B2 (en) | 2002-01-17 | 2012-03-20 | Concept Matrix Llc | Vertebral defect device |
US7674295B2 (en) | 2002-01-17 | 2010-03-09 | Concept Matrix, Llc | Vertebral defect device |
US7740658B2 (en) | 2002-01-17 | 2010-06-22 | Concept Matrix, Llc | Intervertebral disk prosthesis methods of use |
US8167886B2 (en) | 2002-01-17 | 2012-05-01 | Concept Matrix, Llc | Insertion tool for a vertebral defect device |
US7534267B2 (en) | 2002-01-17 | 2009-05-19 | Concept Matrix, L.L.C. | Methods of installing a vertebral defect device |
US10265191B2 (en) | 2003-02-03 | 2019-04-23 | Warsaw Orthopedic, Inc. | Expanding interbody implant and articulating inserter and method |
US9750617B2 (en) | 2003-02-03 | 2017-09-05 | Warsaw Orthopedic, Inc. | Expanding interbody implant and articulating inserter and method |
US7828849B2 (en) | 2003-02-03 | 2010-11-09 | Warsaw Orthopedic, Inc. | Expanding interbody implant and articulating inserter and method |
US9271846B2 (en) | 2003-02-03 | 2016-03-01 | Warsaw Orthopedic, Inc. | Expanding interbody implant and articulating inserter and method |
US8986389B2 (en) | 2003-02-03 | 2015-03-24 | Warsaw, Orthopedic, Inc. | Expanding interbody implant and articulating inserter and method |
US9655651B2 (en) | 2003-05-02 | 2017-05-23 | Yale University | Dynamic spine stabilizer |
US9034016B2 (en) | 2003-05-02 | 2015-05-19 | Yale University | Dynamic spine stabilizer |
US7029475B2 (en) | 2003-05-02 | 2006-04-18 | Yale University | Spinal stabilization method |
US9005252B2 (en) | 2004-06-23 | 2015-04-14 | Yale University | Method for stabilizing a spine |
US8500781B2 (en) | 2004-06-23 | 2013-08-06 | Yale University | Method for stabilizing a spine |
US7931675B2 (en) | 2004-06-23 | 2011-04-26 | Yale University | Dynamic stabilization device including overhanging stabilizing member |
US9681893B2 (en) | 2004-06-23 | 2017-06-20 | Yale University | Method for stabilizing a spine |
US7713288B2 (en) | 2005-08-03 | 2010-05-11 | Applied Spine Technologies, Inc. | Spring junction and assembly methods for spinal device |
US7699875B2 (en) | 2006-04-17 | 2010-04-20 | Applied Spine Technologies, Inc. | Spinal stabilization device with weld cap |
US8353962B2 (en) | 2006-04-28 | 2013-01-15 | Concept Matrix, Llc | Dual composition vertebral defect device |
US7871441B2 (en) | 2006-04-28 | 2011-01-18 | Concept Matrix, Llc | Cervical fixation device |
US10111755B2 (en) | 2017-02-24 | 2018-10-30 | Warsaw, Orthopedic, Inc. | Expanding interbody implant and articulating inserter and methods of use |
US10470894B2 (en) | 2017-04-06 | 2019-11-12 | Warsaw Orthopedic, Inc. | Expanding interbody implant and articulating inserter and methods of use |
US11213404B2 (en) | 2017-04-06 | 2022-01-04 | Warsaw Orthopedic, Inc. | Expanding interbody implant and articulating inserter and methods of use |
WO2022132533A1 (fr) * | 2020-12-16 | 2022-06-23 | K2M, Inc. | Implant expansible augmentable |
Also Published As
Publication number | Publication date |
---|---|
FR2772594A1 (fr) | 1999-06-25 |
AU744241B2 (en) | 2002-02-21 |
US6419706B1 (en) | 2002-07-16 |
JP2001526082A (ja) | 2001-12-18 |
ES2222620T3 (es) | 2005-02-01 |
CA2315803C (fr) | 2008-02-19 |
EP1039855A1 (fr) | 2000-10-04 |
FR2775891B1 (fr) | 2000-08-11 |
ATE269682T1 (de) | 2004-07-15 |
DE69824759T2 (de) | 2005-06-30 |
FR2772594B1 (fr) | 2000-05-05 |
DE69824759D1 (de) | 2004-07-29 |
AU1767099A (en) | 1999-07-12 |
CA2315803A1 (fr) | 1999-07-01 |
EP1039855B1 (fr) | 2004-06-23 |
JP4046471B2 (ja) | 2008-02-13 |
FR2775891A1 (fr) | 1999-09-17 |
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